%0 Journal Article
%T High-speed data format conversion from non-return-to-zero to return-to-zero based on periodically poled lithium niobate waveguides<br>基于周期极化反转铌酸锂光波导高速非归零码到归零码的转换
%A Wang Da-Lin
%A Sun Jun-Qiang
%A Wang Jian
%A <br>汪大林
%A 孙军强
%A 王 健
%J 物理学报
%D 2008
%I 
%X Based on the cascaded second-order nonlinear interactions in a periodically poled lithium niobate waveguide, a novel scheme of all-optical data format conversion from non-return-to-zero to return-to-zero is proposed, using a Mach-Zehnder interferometer structure. The conversion mechanism relies on the amplification effect induced on the signal field via cascaded second-harmonic generation and difference-frequency generation, which makes the Mach-Zehnder interferometer unbalanced and leads to the output of return-to-zero due to destructive interference. Firstly, the non-return-to-zero to return-to-zero conversion process is numerically simulated based on the coupled-wave equations. Secondly, the dependence of the extinction ratio on the waveguide length, optical power, and time-delay is analyzed and optimized. Finally, the conversion bandwidth is also discussed. It is found that the signal wavelength can be tuned in a wide wavelength range of approximately 90nm, thus simultaneous multi-channel non-return-to-zero to return-to-zero data format conversion can potentially be implemented with the proposed scheme.
%K data format conversion
%K cascaded second-harmonic generation and difference-frequency generation
%K periodically poled lithium niobate
%K Mach-Zehnder interferometer<br>码型转换，
%K 级联倍频和差频，
%K 周期极化反转铌酸锂，
%K 马赫-曾德尔干涉仪
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=42C7763AA406D5F835DA0243F7150E48&yid=67289AFF6305E306&vid=11B4E5CC8CDD3201&iid=CA4FD0336C81A37A&sid=10828928EB89AD8E&eid=0F7768518993EDDE&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=20